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    <h2 class="title">第二周10-14阶段小结</h2>
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      <h3 id="学习核心">学习核心</h3>
<ul>
<li>理解中断：特别是网络接收的软中断
<ul>
<li>上半部分</li>
<li>下半部分</li>
</ul>
</li>
<li>平均负载</li>
<li>累积中断次数</li>
<li>cpu指标性能
<ul>
<li>cpu使用率
<ul>
<li>用户cpu使用率</li>
<li>系统cpu使用率</li>
<li>等待io的cpu使用率</li>
<li>软中断和硬中断的cpu使用率</li>
<li>窃取cpu使用率</li>
<li>客户cpu使用率</li>
</ul>
</li>
<li>平均负载</li>
<li>进程上下文切换</li>
<li>cpu缓存命中率</li>
<li></li>
</ul>
</li>
</ul>
<h3 id="工具">工具</h3>
<ul>
<li>sar：添加 -n DEV 参数显示网络收发的报告</li>
<li>watch -d cat /proc/softirqs</li>
<li>tcpdump：通过 -i eth0 选项指定网卡 eth0，并通过 tcp port 80 选项指定 TCP 协议的 80 端口</li>
<li>uptime、mpstat、pidstat</li>
<li>vmstat：查看系统的上下文切换次数和中断次数</li>
<li>top、perf top、perf record、perf report</li>
<li>短时进程execsnoop</li>
<li>dstat</li>
</ul>
<h3 id="把性能指标与工具联合起来">把性能指标与工具联合起来</h3>

    </div>
    <div class="info post_meta">
      <time datetime=2020-06-06T10:02:39&#43;0800 class="date">Saturday, June 6, 2020</time>
      
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          <li> <a href="https://zsy619.github.io/tags/linux%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96">linux性能优化</a> </li>
        
          <li> <a href="https://zsy619.github.io/tags/linux">linux</a> </li>
        
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